KIEV, Ukraine—The whereabouts of Ukrainian President Viktor Yanukovych were unclear on Sunday, a day after he left the capital and his arch foe Yulia Tymoshenko was freed from prison and returned to Kiev to address a massive, adoring crowd.

Ukrainian news agencies, citing the deputy head of the State Border Service, reported that a chartered airplane with Yanukovych onboard was denied permission to take off from Donetsk, a city in eastern Ukraine that is the president's base of support.

The center of Kiev, meanwhile, was calm as the sun came up Sunday after a day that saw a stunning reversal of fortune in Ukraine's political crisis.

Protesters stand guard in front of presidential administrative building in central Kiev, Ukraine, Saturday, Feb. 22, 2014. Protesters in the Ukrainian capital claimed full control of the city Saturday following the signing of a Western-brokered peace deal aimed at ending the nation's three-month political crisis. The nation's embattled president, Viktor Yanukovych, reportedly had fled the capital for his support base in Ukraine's Russia-leaning east. ((AP Photo/Darko Bandic) )

Protesters on Saturday took control of the presidential administration building, and thousands of curious and contemptuous Ukrainians roamed the suddenly open grounds of the lavish compound outside Kiev where Yanukovych was believed to live.

Parliament, which he controlled the previous day but is now emboldened against him, called for his removal and for elections on May 25. But Yanukovych said he now regards the parliament as illegitimate and he won't respect its decisions.

The political crisis in the nation of 46 million, strategically important for Europe, Russia and the United States, has changed with blinding speed repeatedly in the past week.

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First there were signs that tensions were easing, followed by horrifying violence and then a deal signed under Western pressure that aimed to resolve the conflict but left the unity of the country in question.

Tymoshenko, whose diadem of blond peasant braids and stirring rhetoric attracted world attention in the 2004 Orange Revolution, was both sad and excited as she spoke to a crowd of about 50,000 on Kiev's Independence Square, where a sprawling protest tent camp was set up in December.

Men shout slogans during mourning for protesters killed in recent clashes, in central Kiev, Ukraine, Saturday, Feb. 22, 2014. Protesters in the Ukrainian capital claimed full control of the city Saturday following the signing of a Western-brokered peace deal aimed at ending the nation's three-month political crisis. The nation's embattled president, Viktor Yanukovych, reportedly had fled the capital for his support base in Ukraine's Russia-leaning east. ((AP Photo/Darko Bandic) )

Sitting in a wheelchair because of a back problem aggravated during imprisonment, her voice cracked and her face was careworn.

But her words were vivid, praising the protesters who were killed this week in clashes with police that included sniper fire and entreating the living to keep the camp going.

"You are heroes, you are the best thing in Ukraine!" she said of the victims. The Health Ministry on Saturday said the death toll in clashes between protesters and police that included sniper attacks had reached 82.

And she urged the demonstrators not to yield their encampment in the square, known in Ukrainian as the Maidan.

"In no case do you have the right to leave the Maidan until you have concluded everything that you planned to do," she said.

The crowd was thrilled.

"We missed Yulia and her fire so much," said demonstrator Yuliya Sulchanik. Minutes after her release, Tymoshenko said she plans to run for president, and Sulchanik said "Yulia will be the next president—she deserves it."

Under the agreement signed Friday, Yanukovych faces early elections, but it is unclear when they will happen.

His authority in Kiev appeared to be eroding by the hour.

Yanukovych spoke on television in Kharkiv, the heartland of his base of support and ironically the same city where Tymoshenko was imprisoned. He truculently likened his opponents to the rise of Nazism in the 1930s and accused them of a putsch.

"Everything that is happening today is, to a greater degree, vandalism and banditry and a coup d'etat," he said. "I will do everything to protect my country from breakup, to stop bloodshed."

Ukraine is deeply divided between eastern regions that are largely pro-Russian and western areas that widely detest Yanukovych and long for closer ties with the European Union. Yanukovych's shelving of an agreement with the EU in November set off the wave of protests, but they quickly expanded their grievances to corruption, human rights abuses and calls for Yanukovych's resignation.

The conviction of Tymoshenko was one of the underlying issues driving the protests.

After the 2004 Orange Revolution helped bring Viktor Yushchenko to the presidency, Tymoshenko became prime minister.

Anti-government protesters stand guard in front of the Ukrainian parliament in Kiev, Ukraine, Saturday, Feb. 22, 2014. Fears that Ukraine could split in two mounted Saturday as regional lawmakers in the pro-Russian east questioned the authority of the national parliament. Protesters took control of Ukraine's capital and parliament and sought to oust the president. Sign on building reads: Ukrainian Parliament ((AP Photo/ Marko Drobnjakovic))

But when Yanukovych won the 2010 election, Tymoshenko was arrested and put on trial for abuse of office, an action widely seen as political revenge.

On Saturday, before Tymoshenko's arrival, other opposition figures hailed Yanukovych's deteriorating hold on the country.

"The people have won, because we fought for our future," said opposition leader Vitali Klitschko to a euphoric crowd of thousands on Independence Square. Beneath a cold, heavy rain, protesters who have stood for weeks and months to pressure the president to leave congratulated each other and shouted "Glory to Ukraine!"

"It is only the beginning of the battle," Klitschko said, urging calm and telling protesters not to take justice into their own hands.

Top EU foreign envoy Catherine Ashton welcomed the release of Tymoshenko as "an important step forward in view of addressing concerns regarding selective justice in the country."

The president's support base crumbled further as a leading governor and a mayor from the eastern city of Kharkiv fled to Russia.

Oleh Slobodyan, a spokesman for the border guard service, told The Associated Press that the Kharkiv regional governor and mayor left Ukraine across the nearby Russian border. Another service spokesman, Serhiy Astakhov, said the former prosecutor-general and former taxation minister were prevented from leaving on the order of unspecified law-enforcement agencies.

Ukrainian news agencies later quoted Astakhov saying that an aircraft with Yanukovych onboard had been prevented from taking off from Donetsk. It was unclear where the plane was headed.

Russia came out Saturday firmly against the peace deal, saying the opposition isn't holding up its end of the agreement, which calls for protesters to surrender arms and abandon their tent camps. Tymoshenko's entreaty is likely to make the latter condition slow to be fulfilled.

Russian Foreign Minister Sergey Lavrov on Saturday called his German, French and Polish counterparts and urged them to use their influence with the Ukrainian opposition to stop what he described as rampages by its supporters. European officials urged calm.

Ukraine's defense and military officials also called for Ukrainians to stay peaceful. In statements Saturday, both the Defense Ministry and the chief of the armed forces said they will not be drawn into any conflict and will side with the people. But they did not specify whether they still support the president or are with the opposition.

In Kharkiv, governors, provincial officials and legislators gathered alongside top Russian lawmakers and issued a statement saying that the events in Kiev have led to the "paralysis of the central government and destabilization of the situation in the country."

Some called for the formation of volunteer militias to defend against protesters from western regions, even as they urged army units to maintain neutrality and protect ammunition depots.

Anti-government protesters around the country took out their anger on statues of Soviet founder Vladimir Lenin, using ropes and crowbars to knock them off pedestals in several cities and towns. Statues of Lenin still stand across the former U.S.S.R., and they are seen as a symbol of Moscow's rule.

The past week has seen the worst violence in Ukraine since the breakup of the Soviet Union a quarter-century ago. At Independence Square Saturday, protesters heaped flowers on the coffins of the dead.

"These are heroes of Ukraine who gave their lives so that we could live in a different country without Yanukovych," said protester Viktor Fedoruk, 32. "Their names will be written in golden letters in the history of Ukraine."

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Maria Danilova, Yuras Karmanau and Zoro Muradov in Kiev and Vladimir Isachenkov in Moscow contributed to this report.